Expanding apparatus with automatic stopping and adjustable action



H. E. A. GALLON.

EXPANDING APPARATUS WITH AUTOMATIC STOPPING AND ADJUSTABLE ACTION.

APPLICATION FILED MAR. 30, 192l- IPatented Mar. 211, 1922.

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APPLICATION FILED MAR. 30. I921.

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T H. E. A. GALLON. EXPANDING APPARATUS WITH AUTOMATIC STOPPING AND ADJUSTABLE ACTION. APPLICATION FILED MAR. 30. 1921.

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HENRY ERNEST ARISTIDE GALLON, 0F HERBLAY, FRANCE.

patience.

Specification of Letters Patent.

Patented Mar. 21, 11322.

Application filed March 30, 1921. Serial No. 457,118.

To cZZ whom it may concern:

Be it known that l, HENRY ERNEsT Amer-inn GALLON, of 25 Rue de Pontoise, 'lerblay, Seine-et-Qise, France, have invented an ifixpanding Apparatus with Automatic Stopping and Adjustable Action, (for which I have-filed an application in France, Dec. 20, 1919,) of which the following is a full, clear, and exact description.

The invention relates to an apparatus for expanding tubes and ferrules in tube plates and is more particularly adapted to be mechanically actuated; in this apparatus the stoppage of the advance and the withdrawal of the spindle are automaticaily produced as soon as, the expansion being terminated, the unitary pressure produced by the tool on the metal reaches a limit value chosen beforehand according to the work to be effected. The apparatus ceases therefore to advance. as soon as the jumping up of the metal, in the recesses it must occupy, is terminated. Moreover, the spindle which exerts. the pressure on the beading rollers. is automatically and resiliently brought backward, so that the apparatus is ready for a new operation and can pass without stoppage frorh'one tube to the following tube even without stopping the machine actuating it, which latter may constantly rotate during all the work.

[in the accompanying drawing given by way example,

. Fig. i is. anelevation of the apparatus.

Fig. 2 a broken view on an enlarged scale, partly in elevation and partly in section.

Figure 2 is a view partly in elevation and partly in section of the left hand end of the device shown in Figure 2.

Figs. 3, 4i, 5, 6, 7 are sections made respectively according to lines A-A, B-B, C, DD and E+E of Fig. 2.

Fig. 8 is a longitudinal section of a modification of the apparatus.

Fig. 9 is a section made according to lin lF of Fig. l8.

Fig. lO'is' a section made according to line G-G of Fig. 9.

The apparatus comprises a spindle a the front end of which is fitted between the beading rollers Z) and is slightly conical. This spindle is provided with a shoulder 0 having a notch c in which engages the curved end of a torsion spring (Z. The other end this spring is engaged in a similar manner in a notch 6 formed in a seat or shoulder e of a long sleeve f surrounding the rear end of the spindle. This long sleeve or tube f is externally provided with a square part 9, on which can be fitted a crank, or the driving shaft of any driving machine.

The screw-threaded end of the spindle receives a nut hand a locknut h, by means which the compression of the spring d can be adjusted.

The axes of the rollers b are slightly inclined relatively to the generatrices of the barrel 2', so as to produce the advance of the spindle. This barrel is provided with a kind of casing 11 in which is arranged a spring In the walls of the casing i are formed openings 70 in which can slide the blades Z of a screw-threaded ring m. This rin is screwed in the internally screw-threads end of a socket a, the other end of which is provided with an annular ledge or rim a serving as a retaining or holding member for the seat (2. This socket is externally knurled so as to permit of holding it with the hand during the work.

The ring or and the socket n are screwed in each other on a left-handed thread.

The edge of the casing c" receives a screw-threaded ring 0 by means of which the ring m is held in the casing 2'.

For effecting an expanding operation, the barrel of the apparatus is introduced in the end of the tube, or in the ferrule, until the edge of the casing i bears against the tube plate.

The spindle is then pushed home towards the tube and a continuous rotary movement is imparted to the sleeve This rotary movement is transmitted by the spring (Z to the spindle a. The latter actuates the rollers Z) which roll Within the expanded tube, driving along with them the barrel 6 which rotates more slowly than the spindle a.

The spindle progressively moves for ward. producing the necessary pressure.

This pressure increasesand becomes very high when the metal of the tube is perfectly fitted against the walls of the recess wherein it is beaded in. At this moment,

the strain for causing the spindle to rotate has increased to such an extent that the coils of the spring d open, bear against the walls of the socket n and are wedged therein.

The socketm, is then integral with the spindle and rotates with the latter. The ring m follows the barrel 2' in its rotatirm. by means of'the' blades Z; it results therefrom that it does not rotate so quickly as the spindle aand the socket n.

Owing to this difference oi speed, the ring at unscrews in the socket it and advances towards the barrel, thereby compressin the spring j and thus producing on the spindle 'a reaction towards the rear. In fact, this spring takes a bearing on the casing 2' which latter rests on the tube .plate and thepressure it produces on the ring m is transmitted by the socket n to the spindle which at this moment is integral with the said socket. lVhen the compression of the spring is suflicient, the spindle is brought backward by sliding between the rollers. The apparatus can then be Withdrawn and inserted in the following tube.

As will be seen, no sudden stoppage and no rough shock take place. It is a spring that comes in action when the limit of chosen pressure is reached for causing the necessary movement for the disengagement of the spindle and it is another spring which acts on this spring for withdrawing it from between the rollers and bringing it backward.

It will also be understood that the apparatusworks in an equal and uniform mannor, even if the diameters of the recesses and oft-he tubes inserted therein are slightly different. It is the unitary pressure produced that limits the action of the apparatus and prevents it from crushing the metal. .lt sutlices to chose the strength of the spring (I and to adjust its initialcompression.

' The unloosening of the tool takes place automatically whatever may be the str lce eliected by the spindle. The action of the apparatus is uniform in all on s'es "for one and the 'sameadjustment of the driving spring.

The machine actuating the tool mayconstantly rotate, it suffices to successively present the apparatus to the various tubes to be expanded.

When the same operation is begun on the following tube, the socket a is held stationary by means of the hand. As soon as the movement oi? the spindle has started, the barrel also rotates and aetuates the ring 771. thus screwingit again in the socket;

lVhen the ring m is screwed. completely home, the socket n is driven along and at this moment it is released by the hand.

- In the arrangement shown in Figs. 8 to 10, the apparatus is constituted. as above, but the connection atthe end oi the oper tion between the sleeve 7 and the spindle a. is

obtained by means of a driving segment p surrounded by an adherence segment g.

The segment p presents a gap in which are engaged two studs 6 a respectively integral with the sleeve 7 and the spindle a.

The segment 9 is externally provided with circular threads capable of engaging with corresponding threads tormed on the inner wall of the casing at; these threads have a profile. chosen in view of ensuring the transmission ot' the stresses in the direction in which they are exerted.

Inside the segment 2 is arranged a ring '1" adapted to compensate the differences of thickness which might be given to the smooth segment 79, according to the stress it is desired to exert.

A ring i mounted on a ball bearing terminates the casing 2' Suppose it isdesired to expand a tube and that:

1-the strain to be exertedonlthe sleeve 7 for expanding the tube untilit comes in contact with the wall 01" the recess is of 40 kilogramsg'that the strain necessaryfor efi'ecting the rolling of the metal is of 80 kilograms;

2-thc straintor producing'the opening 01 the inner segment is of kilograms and for the outer segment 10 kilograms, so that the total strain for opening both segments simultaneously is of kilograms.

During the first part of the work, that i to say the expansion of the tube the strain exerted on the spindle is less than the opening strain of. the segments. The latter remainthereiore closed; the spindle (4 remains independent from the socket n.

Then the rolling begins and the efi ort necessary for actuating the apparatus increasesup to the value of kilograms indicated above; Y

At the time the value or" this efiort is at 60 kilograms, the segments open; the threads of the outer segment engage with those of the socket 71, thus rendering these two members integral with eachother by'a wedging action.

At this moment, the relative unscrewing of the socket nand of the ring in takesplace, producing the compression of the spring j.

During the period between the passage of the effort at 60 kilograms,-point where the socket and the spindle are rendered integral with one another,and the moment where the effort or strain. reaches 80 kilogramgthe spring is compressed.

At the same time as the working strain reaches 80 kilograms, the compression of the spring reaches the point where it determines the rearward movement of the spindle.

. As soon. as the rearward movement of the spindle 'begins,the pressure of the rollers diminishes rapidly well as the effort to be produced for actuating the apparatus.

When the strain comes back to 60 kilograms, the segments tend to close. lhe ina ces the two members m and n is no longer in dispensable for producing the Withdrawal.

. of the swindle it has onl the advantage of accelerating the same.

In fact, from the moment the adh rence segment renders the spindl integral with the socket n, the latter'moves forward with the spindle compresses the spring. There is a time when the reaction of the spring stops the advance of the spindle, then, after a few revolutions, determines the pulloii and withdrawal of the same.

Instead of the segment 1 covering the studs 0 c from which it is independent, as above described and illustrated, it could be more largely cut away, so that the said studs may be engaged between its ends. -The system forming the subject-matter this invention is a plicable to any existing mandrels. whateve: may be the arrangement of the rollers, barrel, etc.

The abov arrangements are given by way of example only, the forms, dimensions, de tail arrangements and materials used may be varied according to circumstances with out departin thereby from the principle of: the invention.

Claims.

1. In an apparatus for mechanically enpanding the ends of tubes and ferrules in tube plates, 'a conical spindle, beading rollers actuated by the spindle, elastic means receiv' ig the drivingmotion and transmitting it to the spindle, and means actuated by the elastic means when the limit of unitary pressure is reached to stop the Work and tll 'rrft the withdrawal of the spindle.

In an apparatus for expanding the ends of tubes and ferrules in tube plates, a coni cal spindle. beading rollers actuated by the soini'lle, elas ic means receiving the driving motion and transmitting it to the spindle, and means actuated by the elastic means when the limit of unitary pressure is r ached, comprising a spring adapted to react on tee spindle.

3. In an apparatus for mechanicallv expanding the ends of tubes and ferrules in tube plates. a driving shaft. a spindle actuated by the driving shaft, beading means barrel,

oi? the spindle,

carried by the spindle, a resilient intermediate member between the driving sl' sit and the spindle, a meniher having a left hand screw thread, another member screwed in the previous one, a barrel, a spring between the SBCOIKlIHQZHJQZ and the barrel, acaoteil to reset on the spindle.

l. in an apparatus for mechanically expanding the ends of tubes and ferrules in tube plates. beading rollers, a spine e acting on the beading rollers, a roller-carrying b1 rel, a driving shaft, atransmission sprirg capable of transmitting tie normal strain without opening, and opening when this strain is exceeded, a socket with which this ring comes'in engagement, a member in vvl ch the socket is screwed, and a pressure sp ing co-acting with the member.

5. In an apparatus for mechanically e zpanding the ends of tubes and ferrules in tube plates, beading rollers, a spindle acting on the beading rollers, a roller-carrying a driving shaft, a transmission spring, formed by a slotted se 'ment, capable of transmitting the normal str in without opening, and opening when this strain is exceeded, socket with which this saring comes in engagement, a member in which the socket is screwed, and a pressure spring in contact with said member.

6. In an apparatus for mechanically expanding the ends of tubes and ferrules in tube plates, beading rollers, a spimlle acting on the beading rollers, a roller-carrying barrel, driving shaft, a transmission spring formed by a slotted segment, capable of transmitting the normal strain without opening. and opening when this strain is erceei'led, studs on this segment and engaged in a notch oi the driving shaft and ot the spindle.

7. In an apparatus for mechanically expanding the ends of tubes and ferrules in tube plates, beading rollers, a spindle acting on the heading rollers, roller-carrying barrel, driving shaft, a transmission spring formed by a slotted segment, capable of tra .smitting the normal strain without opening, and opening when this strain is exceeded, an adherence segment covering the previous segment, studs on this segment and in notch of the driving shaft and 8. In an apparatus tor mechanically expanding the ends of tubes and ferrules in tube plates, beadingrollers, a spindle acting on the heading rollers, roller-carrying barrel, a driving shaft, transmission spring formed by a slotted segment, capable of transmitting the normal strain without opening, and opening when this strain is eX- ceedcd, an adherence segment covering the previous segment, screw threads on the surtace of the adherence segment. ngaging with corresponding screw threads of the socket,

e'rs mount-ed upon the spindle, to be expand ed and rotated therewith, means for rotating 15 the spindle and causing it to progressively move forward, and means controlled by the spindle operating means for arresting'and retracting the spindle when a predetermined pressure is reached. e

The foregoing specification of my expanding; apparatus with automatic stopping and adjustable action, signed by me this 14th day of March, 1921.

HENRYERNEST ARISTIDE GALLON. 

